Copper Nickel Alloy 90/10（UNS C70600）

Copper nickel alloys are alloys that have moderate strength and thermal stability in high temperature levels. The high oxidation resistance of these alloys is visible in moist air and steam. Copper nickel alloys have 2 to 30% nickel, high oxidation resistance and stress corrosion cracking resistance.

Copper nickel alloys have good fabricability and high inherent resistance to biofouling. The addition of manganese, niobium, iron and or chromium in these alloys improves their corrosion resistance and strength.

Nickel is soluble in copper and this renders the copper nickel alloys as single phase alpha structures. The cast structures have alpha dendrites that contain huge quantities of nickel. The dendrite structure is broken by mechanical treatments. However, the alloying elements do not become homogenized even by repeated thermal and mechanical treatments.

Copper nickel alloys are of two types that include 90/10 and 70/30. The 90/10 alloys are widely used as they are inexpensive. The 90/10 copper nickel alloys have great resistance to sea water corrosion due to the presence of significant amounts of manganese and iron.

Copper nickel alloys are used in the following applications:

• Hydraulic lines
• Fish cages for aquaculture
• Heat exchangers and condensers
• Desalination units
• Sea water pipework
• Tubes for power plants and ships
• Offshore fire water systems
• Copper Nickel Alloy 90/10 UNS C70600 flange
  
• Pumps, valves, sheathing and fittings for ship hulls

The following datasheet will provide details about UNS C70600 copper nickel alloys.

Chemical Composition

The chemical composition of UNS C70600 copper nickel alloys is outlined in the following table.

Element	Content (%)
Cu	88.7
Fe	1.3
Ni	10.0

Physical Properties

The following table shows the physical properties of UNS C70600 copper nickel alloys.

Properties	Metric	Imperial
Density	8.94 g/cm3	0.323 lb/in3

Mechanical Properties

The mechanical properties of UNS C70600 copper nickel alloys are displayed in the following table.

Properties	Metric	Imperial
Tensile strength, ultimate	303-414 MPa	43900-60000 psi
Tensile strength, yield (depending on temper)	110-393 MPa	16000-57000 psi
Elongation at break (in 254 mm)	42.00%	42.00%
Machinability (UNS C36000 (free-cutting brass) = 100%)	20%	20%
Shear modulus	52.0 GPa	7540 ksi
Poisson's ratio	0.34	0.34
Elastic modulus	140 GPa	20300 ksi

Other Designations

Equivalent materials to UNS C70600 copper nickel alloys are:

ASME SB111	ASTM B111	ASTM B466	ASME SB171
ASME SB359	ASTM B122	ASTM B469	MIL T-22214
ASME SB395	ASTM B151	ASTM B543	SAE J461
ASME SB466	ASTM B171	ASTM B608	SAE J463
ASME SB467	ASTM B359	DIN 2.0872	MIL T-16420
ASME SB543	ASTM B395	MIL C-15726	MIL T-15005
ASTM B432

Fabrication and Heat Treatment

Annealing

UNS C70600 copper nickel alloys are annealed at temperatures between 593 and 816°C (1100 and 1500°F)

Cold Working

UNS C70600 copper nickel alloys have good cold working capacity.

Hot Working

Copper nickel 90/10 alloys have good hot forming capacity.

Welding

Copper nickel 90/10 alloys can be welded using gas shielded arc welding, spot welding, coated metal arc welding, butt welding, oxyacetylene welding, brazing, soldering and seam welding processes.

Forging

Temperatures between 843 and 954°C (1550 and 1750°F) are suitable for the forging of 90/10 copper nickel alloys.

Machinability

The machinability rating of copper nickel 90/10 alloys is 20%.

Applications

UNS C70600 copper nickel alloys are used in areas where stainless steel cannot be used due to chloride stress-corrosion cracking and in other parts requiring high levels of corrosion resistance. These alloys are also used as machined and forged valve and pump parts that are utilized for seawater services.

For more information on this source, please visit Yaang Pipe Industry.

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